| Annual Mean SO2 concentration, | |||
| Site Name | Region | µg m-3 | ppb |
| BELFAST 42 | N. Ireland | 53 | 20 |
| LONDONDERRY 11 | N. Ireland | 53 | 20 |
| BELFAST 13 | N. Ireland | 50 | 19 |
| CHESTERFIELD 18 | East Mids | 49 | 18 |
| BRAMPTON 1 | Yorks. & H'side | 47 | 18 |
| DUNMURRY 2 | N. Ireland | 46 | 17 |
| ARMADALE 2 | Scotland | 45 | 17 |
| BARNSLEY 8 | Yorks. & H'side | 44 | 17 |
| BELFAST 44 | N. Ireland | 44 | 17 |
| MANSFIELD WOODHOUSE 2 | East Mids | 43 | 16 |
| STEPNEY 5 | London | 42 | 16 |
| MALTBY 2 | Yorks. & H'side | 41 | 15 |
| CARDIFF 12 | Wales | 40 | 15 |
| BELFAST 45 | N. Ireland | 40 | 15 |
| CUDWORTH 2 | Yorks. & H'side | 37 | 14 |
| BELFAST 12 | N. Ireland | 37 | 14 |
| LONDONDERRY 14 | N. Ireland | 37 | 14 |
| TRAFFORD 1 | North-west | 36 | 14 |